<html>
    <head>
    </head>
    <body>
        Ensure that if an attribute value contains a double quote, it is
        surrounded with single quotes, otherwise with double quotes.
        <span data-test="'single quoted string'">Span content</span>
        <span data-test='"double quoted string"'>Span content</span>
        <span data-test="string without quotes">Span content</span>
    </body>
</html>
